<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>css使用</title>
    <link rel="stylesheet" href="demo01.css">
    <!-- <style>
        p {
            color: red;
        }
    </style> -->
</head>
<body>
    <p>hello</p>

    <!-- <p style="color: red;">hello world</p>
    <p style="color: red;">shdhfjfj</p> -->
</body>
</html>